@using Radzen.Blazor
@using Radzen.Blazor.Rendering
@typeparam TItem
@inherits Radzen.Blazor.CartesianSeries<TItem>
@implements IChartColumnSeries

<CascadingValue Value="@this">
  @ChildContent
</CascadingValue>
@code {
    public override RenderFragment Render(ScaleBase categoryScale, ScaleBase valueScale)
    {
        var category = ComposeCategory(categoryScale);
        var value = ComposeValue(valueScale);
        var ticks = Chart.ValueScale.Ticks(Chart.ValueAxis.TickDistance);
        var y0 = Chart.ValueScale.Scale(Math.Max(0, ticks.Start));
        var style = $"clip-path: url(#{Chart.ClipPath}); -webkit-clip-path: url(#{Chart.ClipPath});";

        var columnSeries = VisibleColumnSeries;
        var index = columnSeries.IndexOf(this);
        var padding = Chart.ColumnOptions.Margin;

        var bandWidth = BandWidth;
        var width = bandWidth / columnSeries.Count() - padding + padding / columnSeries.Count();;
        var className = $"rz-column-series rz-series-{Chart.Series.IndexOf(this)}";

        return 
        @<g class="@className">
            @foreach(var data in Items)
            {
                var x = category(data) - bandWidth / 2 + index * width + index * padding;
                var y = value(data);
                var radius = Chart.ColumnOptions.Radius;

                if (radius > width / 2)
                {
                    radius = 0;
                }

                var path = $"M {x.ToInvariantString()} {(y+radius).ToInvariantString()} A {radius.ToInvariantString()} {radius.ToInvariantString()} 0 0 1 {(x + radius).ToInvariantString()} {y.ToInvariantString()} L {(x + width - radius).ToInvariantString()} {y.ToInvariantString()} A {radius.ToInvariantString()} {radius.ToInvariantString()} 0 0 1 {(x + width).ToInvariantString()} {(y+radius).ToInvariantString()} L {(x+width).ToInvariantString()} {y0.ToInvariantString()} L {x.ToInvariantString()} {y0.ToInvariantString()} Z";

                if (y > y0)
                {
                    path = $"M {x.ToInvariantString()} {y0.ToInvariantString()} L {(x+width).ToInvariantString()} {y0.ToInvariantString()} L {(x+width).ToInvariantString()} {(y-radius).ToInvariantString()} A {radius.ToInvariantString()} {radius.ToInvariantString()} 0 0 1 {(x + width - radius).ToInvariantString()} {y.ToInvariantString()} L {(x + radius).ToInvariantString()} {y.ToInvariantString()} A {radius.ToInvariantString()} {radius.ToInvariantString()} 0 0 1 {x.ToInvariantString()} {(y-radius).ToInvariantString()} L {x.ToInvariantString()} {y0.ToInvariantString()} Z";
                }
                var fill = PickColor(Items.IndexOf(data), Fills, Fill);
                var stroke = PickColor(Items.IndexOf(data), Strokes, Stroke);

                <Path @key="@path" D="@path" Stroke="@stroke" StrokeWidth="@StrokeWidth" Fill="@fill" LineType="@LineType" Style="@style" />
            }
        </g>;
    }
}
